US2602989A - Valve tool - Google Patents

Description

F. AKIN VALVE TOOL July 15, 1952 Filed Oct. 13, 1947 ATTORNEY fin/v5 A/r/N INVENTOR.

Patented July 15, 1952 UNITED STATES PATENT OFFICE 3 2,502,989 vALvE roon 'FrahkAkin, DallasyTexo Application ea tern; 19,47, Serialno. 779,575

eClaims. (61.299217) which eonsists of a frame in which is mounted a valve engaging cross-head capable of longitudinal movement in the frame by means of a screw rod, to lift the valve against the resistance of .its spring, the latter being held by the valve retaining clip. The invention further aims to provide removable valve guide engaging fingers supported by a mounting plate freely movable in the frame onthe screw rod, on which latter is threaded a nut for urging the plate downwardly to exert pressure on the valve guide to relieve pressure of the valve spring on the retaining clip to effect release of the latter and removal of the valve.

Another object of the invention is to provide a valve tool whose novel and simple construction makes possible the extraction and installation of a valve in considerably less time than was heretofore possible with conventional tools designed for the purpose and one which requires no special skillfor its manipulation.

With the foregoing objects in view, the invention has further reference to certain features of accomplishment which will become apparent as the description proceeds, taken in connection with the accompanying drawing wherein:

Figure l is a fragmentary sectional view of an internal combustion engine showing the invention in the preliminary operation of lifting a valve.

Figure 2 is a similar view showing the valve in raised position preparatory to displacing the valve guide.

Figure 3 is yet another position of the tool, showing the valve spring collapsed to relieve pressure on the valve retainer to permit its removal-and extraction of the valve, and

Figure 4 is a .side elevational view of the invention per se.

Continuing with a more detailed description of the drawing, reference is primarily made to Figure 4 wherein numeral l denotes a substantially inverted U-shaped frame having longitudinal slots II in each leg thereof which open at the bottom thereof but terminate short of the top of the frame. Extending freely through an aperture I2 in the top of the frame In is a threaded rod 13 having head 44 at its top and a cross-head l non-rotatably mounted by means ofapin a. onits lower end. The ends of theeross head 15 are .of less width than the body there.- of and are slidably received-in the slots 1110f the frame In, hence the cross=head isv restrained from rotating in the frame.

The cross-head 15 has a cavity in its underside defining claws or hooks It .01? wedge Shape which are adapted to engage under the edges of the head 1-! of a poppet valve, as shown in Figures .1 to 3 inclusive. Freely mounted on the screw rod l 3 within the frame it] .is .a plate It having at each end an aperture -b (Fig; 4).. A pair of fingers 1.9 are provided, one being disposed in each open side of theframe [0, each having ,a pin 28 receivable in .an aperture 12 of the plate. I18 but removable ere rom- A screw 2.! is th a e nt each finger l 9 .to serve as a handlefor better manipulationiof the fingers. i F I I Each of thefingers I9 is bent at}; intermediate its ends to dispose its'lowerend well inwardly of theend of the mounting plate 1'8 for the purpose to bepresently described. m

In order that the operation oftheinvention may be more fully understood, a part of an engine block '23 is shown in Figures 1 to 3 which illustrate also progressive steps employed to. extract a valve. The valve I1 is conventional, as is likewise the valve spring 2.4;, guide 25 and. rea e s 26. Norm l he a is uate l' nder t e iensionv of thes naz hv't e c lm shaft. 21 and cam follower .2 he uppe diof the spring bearin against the valve guicle zfi and wh h latt nin turn. s he d as stjupward displacement by the upper retainingfclip 26. The pressure exerted by the spring 24jis such that without some me m for o r c ing the spring, the upper retainer 26 cannot be withdrawn from the slot of thevalve guide in which it vreposes. A j

The framev ll} of the invention is seton the block 23 in the manner shown and the crank shaft of the engine in manually turned until the head of the valve to be extracted 'islifted from its seat. It is now possible to slide the frame ID sideways so that the valve head will be received in the cavity of the cross-headlli whereby the .opposedhooks 16 will engage thereunder. During this operation, it is "preferred that the fingers H] be left off the tool.

After having set up the tool in the manner described, a wrench is applied to a nut 29 on the screw rod I3 and this nut is rotated to advance the same against the top of the frame [0. This operation raises the screw rod l3 and 3 with it the cross-head [5, thereby lifting the valve I! further from its seat against the resistence of its spring 24. The guide 25 however remains in place due to the presence of the upper retainer 26.

After the valve has been lifted a predetermined distance, the fingers I9 are installed in the manner described and shown, with their lower ends resting on the top of the guide 25. A wrench is then applied to a nut 30 threaded on the screw rod l3 within the frame I9. This nut is brought to bear on the top of the plate 18, causing the same to move downward, urging the fingers l9 against the valve guide 25 and further collapsing the valve spring 24. This latter operation is disclosed in Figure 3 and shows the upper retainer 26 retracted and relieved of the pressure of the spring 24 so that it may easily be withdrawn from the annular groove in the guide 25 in which it is held.

After the retainer 26 has been removed from the guide 25, the valve assembly may be lifted from the block, after which the nut 30 is backed up to relax the spring 24 so that the fingers l8 can be removed. When this is done, the valve assembly will be released from the tool.

' To install a valve assembly, it is necessary to employ a tool, which is of conventional manufacture, to compress the spring 24 in order that the fingers 19 may be set against the top of the valve guide 25. First, however, the valve head is disposed in the cavity of the cross-head IS. The fingers l9 will hold the spring 24 collapsed to allow sufficient spacing between the valve head and guide that the upper retainer 26 may be inserted into the groove of the guide after the valve assembly has been inserted into the motor block 23. When the retainer 26 is in place, the nut 30 is backed up to relax the spring 24 so that the fingers [9 may be removed, after which the crosshead I is slid from the valve [1.

Manifestly, the construction as shown and described is capable of some modification and such modification as may be construed to fall within the scope and meaning of the appended claims is also considered to be within the spirit and intent of the invention.

What is claimed is:

1. A valve gripping tool including an inverted U-shaped frame, a screw rod mounted in said frame adapted to transmit axial thrust, a crosshead mounted in said frame and carried by the lower end of said screw rod and constrained by said frame against other than longitudinal displacement on said screw rod, said cross-head having confronting wedge shaped hooks for engaging underneath the head of a valve, a plate freely mounted on said screw rod above said cross-head, a pair of fingers removably attached at their upper ends to the ends of said plate and whose lower ends are disposed inwardly of the ends of said plate and adapted to bear against the guide on the stem of said valve, a nut on said screw rod adapted to bear against said frame to raise said screw rod and said cross-head, a second nut on said screw rod movable against said plate to effect downward displacement of said fingers, and means carried by each of said fingers for independently manipulating the same.

2. A valve gripping tool including an inverted U-shaped frame, a screw rod freely movable longitudinally therein adapted to transmit axial thrust, a cross-head carried by said screw rod and held by said frame against other than longitudinal displacement on said screw rod, confronting wedge-shaped hooks formed on the underside of said cross-head adapted to receive a valve head, a nut on said screw rod adapted to be advanced against the top of said frame to raise said cross-head, a valve guide engaging finger on each side of said cross-head, and a mounting plate freely mounted on said screw rod above said cross-head to which said fingers are releasably attached and means on said screw rod adapted to be advanced against said plate to effect downward movement of said fingers against said valve guide.

3. In a valve gripping tool, a frame, a screw rod freely movable longitudinally in said frame, a cross-head carried by said rod, a pair of confronting, wedge-shaped hooks formed on the underside of said cross-head and adapted to engage under the head of a valve, a nut threaded on said screw rod and movable against the top of said frame to effect upward displacement of said cross-head, a valve guide engaging finger on each side of said cross-head, the lower portion of said fingers being turned inwardly towards and into parallelism with said screw rod, a plate mounted freely on said screw rod above said cross-head for suspending said fingers and means threaded on said screw rod adapted to be advanced against said plate to move said fingers into engagement with said valve guide.

4. In a valve gripping tool, a frame, a screw rod extending freely through said frame, a crosshead mounted on said screw rod and held by said frame against other than longitudinal displacement in said frame, a pair of opposed, wedge-shaped hooks carried by said cross-head adapted to engage the head of a valve, a nut threaded on said screw rod and movable against said frame to raise said cross-head, a finger on each side of said cross-head, said fingers being adapted to engage the top ofthe guide of said valve, means on said screw rod above said crosshead for supporting said fingers and means threaded on said screw rod and movable against said finger supporting means to urge said fingers operatively against said valve guide.

FRANK AKIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,378,463 Johnson May 17, 1921 1,601,752 Wortham Oct. 5, 1926 2,277,346 Nichols et al. Mar. 24, 1942 2,421,324 Graham May 27, 1947 FOREIGN PATENTS Number Country Date 403,827 Great Britain Jan. 4, 1934

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